My dad showed me how to do this & I wear mine with my wedding band. It's cool, because the wording on the edge of the coin ends up in the middle of the ring! Do you have a quarter from 1964 or before? If you do, it is made of silver. You can turn that coin into a nice silver band using a spoon, a drill, and a metal file. (And no, it's not illegal.)
Just print off any picture you want, then spray paint a piece of wood black, cut the picture to match the size of the wood. Using Mod podge coat the wood then lay the picture on top. Once it has dried thoroughly, use sandpaper to rough up the edges, then put a layer of mod podge over the picture. Put some eye hooks and use pretty ribbon as a hanger and voila.